ICD-10-CM 2027
ICD-10 code for congenital infective pneumonia
From the official ICD-10-CM alphabetic index entry “Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › congenital (infective)”. Page updated September 29, 2026.
About coding congenital infective pneumonia
The ICD-10-CM code for congenital infective pneumonia is P23.9 (Congenital pneumonia, unspecified). The official index lists 13 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on P23.9.
Within P23, choose P23.9 (unspecified) only when documentation doesn't support a more specific option: due to viral agent (P23.0), due to Chlamydia (P23.1), due to staphylococcus (P23.2), due to streptococcus, group B (P23.3), due to Escherichia coli (P23.4), due to Pseudomonas (P23.5), due to other bacterial agents (P23.6) and due to other organisms (P23.8).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific congenital infective pneumonia codes (official index)
- due to
- bacterium NEC P23.6 — Congenital pneumonia due to other bacterial agents
- Chlamydia P23.1 — Congenital pneumonia due to Chlamydia
- Escherichia coli P23.4 — Congenital pneumonia due to Escherichia coli
- Haemophilus influenzae P23.6 — Congenital pneumonia due to other bacterial agents
- infective organism NEC P23.8 — Congenital pneumonia due to other organisms
- Klebsiella pneumoniae P23.6 — Congenital pneumonia due to other bacterial agents
- Mycoplasma P23.6 — Congenital pneumonia due to other bacterial agents
- Pseudomonas P23.5 — Congenital pneumonia due to Pseudomonas
- Staphylococcus P23.2 — Congenital pneumonia due to staphylococcus
- Streptococcus (except group B) P23.6 — Congenital pneumonia due to other bacterial agents
- group B P23.3 — Congenital pneumonia due to streptococcus, group B
- viral agent P23.0 — Congenital pneumonia due to viral agent
- specified NEC P23.8 — Congenital pneumonia due to other organisms
Common questions about congenital infective pneumonia ICD-10 codes
What is the ICD-10 code for congenital infective pneumonia?
- P23.9 — Congenital pneumonia, unspecified. More specific codes apply when the documentation supports them: P23.6, P23.1, P23.4, P23.6 and others below.
Is P23.9 billable?
- Yes. P23.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P23.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P23.9 as a principal diagnosis.
Is P23.9 a CC or MCC?
- P23.9 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.